miss america winners from the 1920's and 1930's had a average bmi of 19.4. a sample of recent winners had reported bmis of 19.1, 18.8, 19, 19.9, 18.9, 19.3, 18.3, 19, 18.8, and 18.5 . do recent winners appear to be significantly different from those in the 1920s and 1930s? (assume normality)